1.

A stone is dropped into a quiet lake and waves moves in circles at a speed of 3 cm/s. At the instant, when the radius of the circular wave is 10 cm, then the rate at which its perimeter is increasing is

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A stone is dropped into a quiet lake and waves moves in circles at a speed of 3 cm/s. At the instant, when the radius of the circular wave is 10 cm, then the rate at which its perimeter is increasing is



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